TCP/IP - CO2 Bricklet 2.0¶

Basic Functions¶

BrickletCO2V2.get_all_values¶

Function ID:	1
Request:	empty payload
Response:	co2_concentration – Type: uint16, Unit: 1 ppm, Range: [0 to 40000] temperature – Type: int16, Unit: 1/100 °C, Range: [-4000 to 12000] humidity – Type: uint16, Unit: 1/100 %, Range: [0 to 10000]

Returns all values measured by the CO2 Bricklet 2.0.

If you want to get the values periodically, it is recommended to use the CALLBACK_ALL_VALUES callback. You can set the callback configuration with set_all_values_callback_configuration.

Note

The sensor is able to messure up to 120 °C. However it is only specified up to 70 °C. Exposing the Bricklet to higher temperatures might result in permanent damage.

BrickletCO2V2.set_air_pressure¶

Function ID:	2
Request:	air_pressure – Type: uint16, Unit: 1 hPa, Range: [0, 700 to 1200], Default: 0
Response:	no response

The CO2 concentration depends (among other things) on the ambient air pressure.

To increase the accuracy of the CO2 Bricklet 2.0 you can set the current air pressure. You use the Barometer Bricklet 2.0 or the Air Quality Bricklet to get the current air pressure.

By default air pressure compensation is disabled. Once you set a value it will be used for compensation. You can turn the compensation off again by setting the value to 0.

It is sufficient to update the value every few minutes.

BrickletCO2V2.get_air_pressure¶

Function ID:	3
Request:	empty payload
Response:	air_pressure – Type: uint16, Unit: 1 hPa, Range: [0, 700 to 1200], Default: 0

Returns the ambient air pressure as set by set_air_pressure.

BrickletCO2V2.set_temperature_offset¶

Function ID:	4
Request:	offset – Type: uint16, Unit: 1/100 °C, Range: [0 to 216 - 1]
Response:	no response

Sets a temperature offset. A offset of 10 will decrease the measured temperature by 0.1 °C.

If you install this Bricklet into an enclosure and you want to measure the ambient temperature, you may have to decrease the measured temperature by some value to compensate for the error because of the heating inside of the enclosure.

We recommend that you leave the parts in the enclosure running for at least 24 hours such that a temperature equilibrium can be reached. After that you can measure the temperature directly outside of enclosure and set the difference as offset.

This temperature offset is used to calculate the relative humidity and CO2 concentration. In case the Bricklet is installed in an enclosure, we recommend to measure and set the temperature offset to improve the accuracy of the measurements.

It is sufficient to set the temperature offset once. The offset is saved in non-volatile memory and is applied again after a power loss.

BrickletCO2V2.get_temperature_offset¶

Function ID:	5
Request:	empty payload
Response:	offset – Type: uint16, Unit: 1/100 °C, Range: [0 to 216 - 1]

Returns the temperature offset as set by set_temperature_offset.

BrickletCO2V2.get_co2_concentration¶

Function ID:	9
Request:	empty payload
Response:	co2_concentration – Type: uint16, Unit: 1 ppm, Range: [0 to 40000]

Returns CO2 concentration.

If you want to get the value periodically, it is recommended to use the CALLBACK_CO2_CONCENTRATION callback. You can set the callback configuration with set_co2_concentration_callback_configuration.

BrickletCO2V2.get_temperature¶

Function ID:	13
Request:	empty payload
Response:	temperature – Type: int16, Unit: 1/100 °C, Range: [-4000 to 12000]

Returns temperature.

Note

The sensor is able to messure up to 120 °C. However it is only specified up to 70 °C. Exposing the Bricklet to higher temperatures might result in permanent damage.

If you want to get the value periodically, it is recommended to use the CALLBACK_TEMPERATURE callback. You can set the callback configuration with set_temperature_callback_configuration.

BrickletCO2V2.get_humidity¶

Function ID:	17
Request:	empty payload
Response:	humidity – Type: uint16, Unit: 1/100 %, Range: [0 to 10000]

Returns relative humidity.

If you want to get the value periodically, it is recommended to use the CALLBACK_HUMIDITY callback. You can set the callback configuration with set_humidity_callback_configuration.

Advanced Functions¶

BrickletCO2V2.get_spitfp_error_count¶

Function ID:	234
Request:	empty payload
Response:	error_count_ack_checksum – Type: uint32, Range: [0 to 232 - 1] error_count_message_checksum – Type: uint32, Range: [0 to 232 - 1] error_count_frame – Type: uint32, Range: [0 to 232 - 1] error_count_overflow – Type: uint32, Range: [0 to 232 - 1]

Returns the error count for the communication between Brick and Bricklet.

The errors are divided into

• ACK checksum errors,
• message checksum errors,
• framing errors and
• overflow errors.

The errors counts are for errors that occur on the Bricklet side. All Bricks have a similar function that returns the errors on the Brick side.

BrickletCO2V2.set_status_led_config¶

Function ID:	239
Request:	config – Type: uint8, Range: See meanings, Default: 3
Response:	no response

Sets the status LED configuration. By default the LED shows communication traffic between Brick and Bricklet, it flickers once for every 10 received data packets.

You can also turn the LED permanently on/off or show a heartbeat.

If the Bricklet is in bootloader mode, the LED is will show heartbeat by default.

The following meanings are defined for the elements of this function:

For config:

• 0 = Off
• 1 = On
• 2 = Show Heartbeat
• 3 = Show Status

BrickletCO2V2.get_status_led_config¶

Function ID:	240
Request:	empty payload
Response:	config – Type: uint8, Range: See meanings, Default: 3

Returns the configuration as set by set_status_led_config

The following meanings are defined for the elements of this function:

For config:

• 0 = Off
• 1 = On
• 2 = Show Heartbeat
• 3 = Show Status

BrickletCO2V2.get_chip_temperature¶

Function ID:	242
Request:	empty payload
Response:	temperature – Type: int16, Unit: 1 °C, Range: [-215 to 215 - 1]

Returns the temperature as measured inside the microcontroller. The value returned is not the ambient temperature!

The temperature is only proportional to the real temperature and it has bad accuracy. Practically it is only useful as an indicator for temperature changes.

BrickletCO2V2.reset¶

Function ID:	243
Request:	empty payload
Response:	no response

Calling this function will reset the Bricklet. All configurations will be lost.

After a reset you have to create new device objects, calling functions on the existing ones will result in undefined behavior!

BrickletCO2V2.get_identity¶

Function ID:	255
Request:	empty payload
Response:	uid – Type: char[8] connected_uid – Type: char[8] position – Type: char, Range: ['a' to 'h', 'z'] hardware_version – Type: uint8[3] 0: major – Type: uint8, Range: [0 to 255] 1: minor – Type: uint8, Range: [0 to 255] 2: revision – Type: uint8, Range: [0 to 255] firmware_version – Type: uint8[3] 0: major – Type: uint8, Range: [0 to 255] 1: minor – Type: uint8, Range: [0 to 255] 2: revision – Type: uint8, Range: [0 to 255] device_identifier – Type: uint16, Range: [0 to 216 - 1]

Returns the UID, the UID where the Bricklet is connected to, the position, the hardware and firmware version as well as the device identifier.

The position can be 'a', 'b', 'c', 'd', 'e', 'f', 'g' or 'h' (Bricklet Port). A Bricklet connected to an Isolator Bricklet is always at position 'z'.

The device identifier numbers can be found here. 

Callback Configuration Functions¶

BrickletCO2V2.set_all_values_callback_configuration¶

Function ID:	6
Request:	period – Type: uint32, Unit: 1 ms, Range: [0 to 232 - 1], Default: 0 value_has_to_change – Type: bool, Default: false
Response:	no response

The period is the period with which the CALLBACK_ALL_VALUES callback is triggered periodically. A value of 0 turns the callback off.

If the value has to change-parameter is set to true, the callback is only triggered after at least one of the values has changed. If the values didn't change within the period, the callback is triggered immediately on change.

If it is set to false, the callback is continuously triggered with the period, independent of the value.

BrickletCO2V2.get_all_values_callback_configuration¶

Function ID:	7
Request:	empty payload
Response:	period – Type: uint32, Unit: 1 ms, Range: [0 to 232 - 1], Default: 0 value_has_to_change – Type: bool, Default: false

Returns the callback configuration as set by set_all_values_callback_configuration.

BrickletCO2V2.set_co2_concentration_callback_configuration¶

Function ID:	10
Request:	period – Type: uint32, Unit: 1 ms, Range: [0 to 232 - 1], Default: 0 value_has_to_change – Type: bool, Default: false option – Type: char, Range: See meanings, Default: 'x' min – Type: uint16, Unit: 1 ppm, Range: [0 to 216 - 1], Default: 0 max – Type: uint16, Unit: 1 ppm, Range: [0 to 216 - 1], Default: 0
Response:	no response

The period is the period with which the CALLBACK_CO2_CONCENTRATION callback is triggered periodically. A value of 0 turns the callback off.

If the value has to change-parameter is set to true, the callback is only triggered after the value has changed. If the value didn't change within the period, the callback is triggered immediately on change.

If it is set to false, the callback is continuously triggered with the period, independent of the value.

It is furthermore possible to constrain the callback with thresholds.

The option-parameter together with min/max sets a threshold for the CALLBACK_CO2_CONCENTRATION callback.

The following options are possible:

Option	Description
'x'	Threshold is turned off
'o'	Threshold is triggered when the value is outside the min and max values
'i'	Threshold is triggered when the value is inside or equal to the min and max values
'<'	Threshold is triggered when the value is smaller than the min value (max is ignored)
'>'	Threshold is triggered when the value is greater than the min value (max is ignored)

If the option is set to 'x' (threshold turned off) the callback is triggered with the fixed period.

The following meanings are defined for the elements of this function:

For option:

• 'x' = Off
• 'o' = Outside
• 'i' = Inside
• '<' = Smaller
• '>' = Greater

BrickletCO2V2.get_co2_concentration_callback_configuration¶

Function ID:	11
Request:	empty payload
Response:	period – Type: uint32, Unit: 1 ms, Range: [0 to 232 - 1], Default: 0 value_has_to_change – Type: bool, Default: false option – Type: char, Range: See meanings, Default: 'x' min – Type: uint16, Unit: 1 ppm, Range: [0 to 216 - 1], Default: 0 max – Type: uint16, Unit: 1 ppm, Range: [0 to 216 - 1], Default: 0

Returns the callback configuration as set by set_co2_concentration_callback_configuration.

The following meanings are defined for the elements of this function:

For option:

• 'x' = Off
• 'o' = Outside
• 'i' = Inside
• '<' = Smaller
• '>' = Greater

BrickletCO2V2.set_temperature_callback_configuration¶

Function ID:	14
Request:	period – Type: uint32, Unit: 1 ms, Range: [0 to 232 - 1], Default: 0 value_has_to_change – Type: bool, Default: false option – Type: char, Range: See meanings, Default: 'x' min – Type: int16, Unit: 1/100 °C, Range: [-215 to 215 - 1], Default: 0 max – Type: int16, Unit: 1/100 °C, Range: [-215 to 215 - 1], Default: 0
Response:	no response

The period is the period with which the CALLBACK_TEMPERATURE callback is triggered periodically. A value of 0 turns the callback off.

If the value has to change-parameter is set to true, the callback is only triggered after the value has changed. If the value didn't change within the period, the callback is triggered immediately on change.

If it is set to false, the callback is continuously triggered with the period, independent of the value.

It is furthermore possible to constrain the callback with thresholds.

The option-parameter together with min/max sets a threshold for the CALLBACK_TEMPERATURE callback.

The following options are possible:

Option	Description
'x'	Threshold is turned off
'o'	Threshold is triggered when the value is outside the min and max values
'i'	Threshold is triggered when the value is inside or equal to the min and max values
'<'	Threshold is triggered when the value is smaller than the min value (max is ignored)
'>'	Threshold is triggered when the value is greater than the min value (max is ignored)

If the option is set to 'x' (threshold turned off) the callback is triggered with the fixed period.

The following meanings are defined for the elements of this function:

For option:

• 'x' = Off
• 'o' = Outside
• 'i' = Inside
• '<' = Smaller
• '>' = Greater

BrickletCO2V2.get_temperature_callback_configuration¶

Function ID:	15
Request:	empty payload
Response:	period – Type: uint32, Unit: 1 ms, Range: [0 to 232 - 1], Default: 0 value_has_to_change – Type: bool, Default: false option – Type: char, Range: See meanings, Default: 'x' min – Type: int16, Unit: 1/100 °C, Range: [-215 to 215 - 1], Default: 0 max – Type: int16, Unit: 1/100 °C, Range: [-215 to 215 - 1], Default: 0

Returns the callback configuration as set by set_temperature_callback_configuration.

The following meanings are defined for the elements of this function:

For option:

• 'x' = Off
• 'o' = Outside
• 'i' = Inside
• '<' = Smaller
• '>' = Greater

BrickletCO2V2.set_humidity_callback_configuration¶

Function ID:	18
Request:	period – Type: uint32, Unit: 1 ms, Range: [0 to 232 - 1], Default: 0 value_has_to_change – Type: bool, Default: false option – Type: char, Range: See meanings, Default: 'x' min – Type: uint16, Unit: 1/100 %, Range: [0 to 216 - 1], Default: 0 max – Type: uint16, Unit: 1/100 %, Range: [0 to 216 - 1], Default: 0
Response:	no response

The period is the period with which the CALLBACK_HUMIDITY callback is triggered periodically. A value of 0 turns the callback off.

If the value has to change-parameter is set to true, the callback is only triggered after the value has changed. If the value didn't change within the period, the callback is triggered immediately on change.

If it is set to false, the callback is continuously triggered with the period, independent of the value.

It is furthermore possible to constrain the callback with thresholds.

The option-parameter together with min/max sets a threshold for the CALLBACK_HUMIDITY callback.

The following options are possible:

Option	Description
'x'	Threshold is turned off
'o'	Threshold is triggered when the value is outside the min and max values
'i'	Threshold is triggered when the value is inside or equal to the min and max values
'<'	Threshold is triggered when the value is smaller than the min value (max is ignored)
'>'	Threshold is triggered when the value is greater than the min value (max is ignored)

If the option is set to 'x' (threshold turned off) the callback is triggered with the fixed period.

The following meanings are defined for the elements of this function:

For option:

• 'x' = Off
• 'o' = Outside
• 'i' = Inside
• '<' = Smaller
• '>' = Greater

BrickletCO2V2.get_humidity_callback_configuration¶

Function ID:	19
Request:	empty payload
Response:	period – Type: uint32, Unit: 1 ms, Range: [0 to 232 - 1], Default: 0 value_has_to_change – Type: bool, Default: false option – Type: char, Range: See meanings, Default: 'x' min – Type: uint16, Unit: 1/100 %, Range: [0 to 216 - 1], Default: 0 max – Type: uint16, Unit: 1/100 %, Range: [0 to 216 - 1], Default: 0

Returns the callback configuration as set by set_humidity_callback_configuration.

The following meanings are defined for the elements of this function:

For option:

• 'x' = Off
• 'o' = Outside
• 'i' = Inside
• '<' = Smaller
• '>' = Greater

Callbacks¶

BrickletCO2V2.CALLBACK_ALL_VALUES¶

Function ID:	8
Response:	co2_concentration – Type: uint16, Unit: 1 ppm, Range: [0 to 40000] temperature – Type: int16, Unit: 1/100 °C, Range: [-4000 to 12000] humidity – Type: uint16, Unit: 1/100 %, Range: [0 to 10000]

This callback is triggered periodically according to the configuration set by set_all_values_callback_configuration.

The response values are the same as get_all_values.

Note

The sensor is able to messure up to 120 °C. However it is only specified up to 70 °C. Exposing the Bricklet to higher temperatures might result in permanent damage.

BrickletCO2V2.CALLBACK_CO2_CONCENTRATION¶

Function ID:	12
Response:	co2_concentration – Type: uint16, Unit: 1 ppm, Range: [0 to 40000]

This callback is triggered periodically according to the configuration set by set_co2_concentration_callback_configuration.

The response value is the same as get_co2_concentration.

BrickletCO2V2.CALLBACK_TEMPERATURE¶

Function ID:	16
Response:	temperature – Type: int16, Unit: 1/100 °C, Range: [-4000 to 12000]

This callback is triggered periodically according to the configuration set by set_temperature_callback_configuration.

The response value is the same as get_temperature.

BrickletCO2V2.CALLBACK_HUMIDITY¶

Function ID:	20
Response:	humidity – Type: uint16, Unit: 1/100 %, Range: [0 to 10000]

This callback is triggered periodically according to the configuration set by set_humidity_callback_configuration.

The response value is the same as get_humidity.

Internal Functions¶

Internal functions are used for maintenance tasks such as flashing a new firmware of changing the UID of a Bricklet. These task should be performed using Brick Viewer instead of using the internal functions directly.

BrickletCO2V2.set_bootloader_mode¶

Function ID:	235
Request:	mode – Type: uint8, Range: See meanings
Response:	status – Type: uint8, Range: See meanings

Sets the bootloader mode and returns the status after the requested mode change was instigated.

You can change from bootloader mode to firmware mode and vice versa. A change from bootloader mode to firmware mode will only take place if the entry function, device identifier and CRC are present and correct.

This function is used by Brick Viewer during flashing. It should not be necessary to call it in a normal user program.

The following meanings are defined for the elements of this function:

For mode:

• 0 = Bootloader
• 1 = Firmware
• 2 = Bootloader Wait For Reboot
• 3 = Firmware Wait For Reboot
• 4 = Firmware Wait For Erase And Reboot

For status:

• 0 = OK
• 1 = Invalid Mode
• 2 = No Change
• 3 = Entry Function Not Present
• 4 = Device Identifier Incorrect
• 5 = CRC Mismatch

BrickletCO2V2.get_bootloader_mode¶

Function ID:	236
Request:	empty payload
Response:	mode – Type: uint8, Range: See meanings

Returns the current bootloader mode, see set_bootloader_mode.

The following meanings are defined for the elements of this function:

For mode:

• 0 = Bootloader
• 1 = Firmware
• 2 = Bootloader Wait For Reboot
• 3 = Firmware Wait For Reboot
• 4 = Firmware Wait For Erase And Reboot

BrickletCO2V2.set_write_firmware_pointer¶

Function ID:	237
Request:	pointer – Type: uint32, Unit: 1 B, Range: [0 to 232 - 1]
Response:	no response

Sets the firmware pointer for write_firmware. The pointer has to be increased by chunks of size 64. The data is written to flash every 4 chunks (which equals to one page of size 256).

This function is used by Brick Viewer during flashing. It should not be necessary to call it in a normal user program.

BrickletCO2V2.write_firmware¶

Function ID:	238
Request:	data – Type: uint8[64], Range: [0 to 255]
Response:	status – Type: uint8, Range: [0 to 255]

Writes 64 Bytes of firmware at the position as written by set_write_firmware_pointer before. The firmware is written to flash every 4 chunks.

You can only write firmware in bootloader mode.

This function is used by Brick Viewer during flashing. It should not be necessary to call it in a normal user program.

BrickletCO2V2.write_uid¶

Function ID:	248
Request:	uid – Type: uint32, Range: [0 to 232 - 1]
Response:	no response

Writes a new UID into flash. If you want to set a new UID you have to decode the Base58 encoded UID string into an integer first.

We recommend that you use Brick Viewer to change the UID.

BrickletCO2V2.read_uid¶

Function ID:	249
Request:	empty payload
Response:	uid – Type: uint32, Range: [0 to 232 - 1]

Returns the current UID as an integer. Encode as Base58 to get the usual string version.